The key you require is "If EXPR is a bareword, the require assumes a ``.pm'' extension and replaces ``::'' with ``/'' in the filename for you, to make it easy to load standard modules. This form of loading of modules does not risk altering your namespace." (from require). See also %INC and @INC.
Update which doesn't actually say anything about it. However:
use lib ".\\";
print "$_\n" for @INC;
Prints:
.\
C:\Program Files\ActiveState Komodo 3.5\lib\support\dbgp\perllib
C:/Perl/lib
C:/Perl/site/lib
.
On an XP system and:
print "$_ => $INC{$_}\n" for keys %INC;
prints in part:
IO/Socket/UNIX.pm => C:/Perl/lib/IO/Socket/UNIX.pm
IO.pm => C:/Perl/lib/IO.pm
Carp.pm => C:/Perl/lib/Carp.pm
bytes.pm => C:/Perl/lib/bytes.pm
DB/RedirectStdOutput.pm => C:\Program Files\ActiveState Komodo 3.5\lib
+\support\dbgp\perllib/DB/RedirectStdOutput.pm
DWIM is Perl's answer to Gödel
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